Nine days after knocking the Czech out of the Eastbourne International in the second round, Boulter repeated the feat on Centre Court at Wimbledon, with a 3-6, 7-6(4), 6-4 win over the 2021 finalist.
Swiatek, the freshly crowned French Open champion, will look to extend her 35-match winning streak when she takes on qualifier Jana Fett after Friday's draw at the All England Club.
Poland's Iga Swiatek expanded her lead at the top of the WTA rankings released on Monday after her French Open triumph in Paris over American Coco Gauff.
After claiming her 35th successive match victory and sixth consecutive title on Saturday against Coco Gauff in Paris, the Polish star Iga Swiatek said that watching how Rafael Nadal has met success and failure had helped to shape her own path to the highs and lows of life on tour.
French Open women's champion Iga Swiatek said she was "overwhelmed" when she saw that Poland striker Robert Lewandowski was in attendance to witness her claim a second Grand Slam title in Paris.
World Number 1 Iga Swiatek expressed happiness following her second French Open title win after defeating American teenager Coco Gauff in the finals of the Roland Garros 2022.